41 lines
1.6 KiB
Go
41 lines
1.6 KiB
Go
package responsemodifers
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import (
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_ "embed"
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"ladder/proxychain"
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"ladder/proxychain/responsemodifers/rewriters"
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"strings"
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)
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// injectScript modifies HTTP responses
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// to execute javascript at a particular time.
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func injectScript(js string, execTime rewriters.ScriptExecTime) proxychain.ResponseModification {
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return func(chain *proxychain.ProxyChain) error {
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// don't add rewriter if it's not even html
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ct := chain.Response.Header.Get("content-type")
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if !strings.HasPrefix(ct, "text/html") {
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return nil
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}
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rr := rewriters.NewScriptInjectorRewriter(js, execTime)
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htmlRewriter := rewriters.NewHTMLRewriter(chain.Response.Body, rr)
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chain.Response.Body = htmlRewriter
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return nil
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}
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}
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// InjectScriptBeforeDOMContentLoaded modifies HTTP responses to inject a JS before DOM Content is loaded (script tag in head)
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func InjectScriptBeforeDOMContentLoaded(js string, execTime rewriters.ScriptExecTime) proxychain.ResponseModification {
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return injectScript(js, rewriters.BeforeDOMContentLoaded)
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}
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// InjectScriptAfterDOMContentLoaded modifies HTTP responses to inject a JS after DOM Content is loaded (script tag in head)
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func InjectScriptAfterDOMContentLoaded(js string, execTime rewriters.ScriptExecTime) proxychain.ResponseModification {
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return injectScript(js, rewriters.AfterDOMContentLoaded)
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}
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// InjectScriptAfterDOMIdle modifies HTTP responses to inject a JS after the DOM is idle (ie: js framework loaded)
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func InjectScriptAfterDOMIdle(js string, execTime rewriters.ScriptExecTime) proxychain.ResponseModification {
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return injectScript(js, rewriters.AfterDOMIdle)
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}
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